---
type: threshold
id: methyl-chloroform-1-1-1-trichloroethane-2
asset: workplace-exposure-limits
title: "Methyl chloroform; 1,1,1-trichloroethane — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side"
sources:
  - https://www.dir.ca.gov/title8/5155.html
source_quote: "71556 | | Methyl chloroform; 1,1,1-trichloroethane | 350 | 1900 | 800 ppm | 450 | 2450"
generated: true
harvested: 2026-08-05
stale_after: 2027-08-05
substance: "Methyl chloroform; 1,1,1-trichloroethane"
pel_ppm: "350"
pel_mgm3: "1900"
ceiling: "800 ppm"
stel_ppm: "450"
stel_mgm3: "2450"
verified: true
---
**Substance:** Methyl chloroform; 1,1,1-trichloroethane

**PEL (ppm):** 350

**PEL (mg/m³):** 1900

**Ceiling:** 800 ppm

**STEL (ppm):** 450

**STEL (mg/m³):** 2450

> 71556 | | Methyl chloroform; 1,1,1-trichloroethane | 350 | 1900 | 800 ppm | 450 | 2450

Source: <https://www.dir.ca.gov/title8/5155.html>